我为Piter工作,我只想使用文字,不过,我似乎可以让它发挥作用。

经过一些研究,我发现,该网页和,这个网站。 这两条都是很大的参考,在用两种功能装满文字后,我只得看文 displayed。

www.un.org/Depts/DGACM/index_spanish.htm 非常简单的文本显示功能 (无工作)

void drawTexture(GLuint texture, float x, float y, float w, float h)
{
   glBindTexture(GL_TEXTURE_2D,texture);

   GLfloat box[] = {x,y+h, x+w,y+h, x,y, x+w,y};
   GLfloat tex[] = {0,0, 1,0, 1,1, 0,1};

   glEnableClientState(GL_VERTEX_ARRAY);
   glEnableClientState(GL_TEXTURE_COORD_ARRAY);

   glVertexPointer(2, GL_FLOAT, 0,box);
   glTexCoordPointer(2, GL_FLOAT, 0, tex);

   glDrawArrays(GL_TRIANGLE_STRIP,0,4);

   glDisableClientState(GL_VERTEX_ARRAY);
   glDisableClientState(GL_TEXTURE_COORD_ARRAY);
}

通常,我并不是每个框架都设置一个阵列,只能显示形象,但这只是一个例子。 当我行使这一职能时,我没有任何东西。 Bla-无形象,无所作为(当然,我以前曾使彩色阵列,后来又使色体残疾)

<>二级简单显示功能 (这只使用一个速效的班级)

void draw_rect(RectObject* robj){
    glVertexPointer(2, GL_FLOAT, 0, [robj vertices]);
    glEnableClientState(GL_VERTEX_ARRAY);
    glColorPointer(4, GL_UNSIGNED_BYTE, 0, [robj colors]);
    glEnableClientState(GL_COLOR_ARRAY);

    if ([robj texture] != -1){
        glEnable(GL_TEXTURE_COORD_ARRAY);
        glEnable(GL_TEXTURE_2D);
        glClientActiveTexture([robj texture]);

        glTexCoordPointer(2, GL_FLOAT, 0, defaultTexCoord);
        glBindTexture(GL_TEXTURE_2D, [robj texture]);
    }

    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

    glDisable(GL_TEXTURE_2D);
    glDisable(GL_TEXTURE_COORD_ARRAY);
}

而另一方面,这项职能确实改变了显示,而不是产生结果,但是它却产生了黑广场......

Setup Background

我的 in

glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_SRC_COLOR);

<>Two LONG Texture Loading Functions

struct Texture2D LoadImage(NSString* path)
{
    struct Texture2D tex;
    tex.texture = -1;

    // Id for texture 
    GLuint texture;
    // Generate textures
    glGenTextures(1, &texture);
    // Bind it
    glBindTexture(GL_TEXTURE_2D, texture);
    // Set a few parameters to handle drawing the image
    // at lower and higher sizes than original
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);

    //NSString *path = [[NSString alloc] initWithUTF8String:imagefile.c_str()];
    path = [[NSBundle mainBundle] pathForResource:path ofType:@""];
    NSData *texData = [[NSData alloc] initWithContentsOfFile:path];
    UIImage *image = [[UIImage alloc] initWithData:texData];
    if (image == nil)
        return tex;
    // Get Image size
    GLuint width = CGImageGetWidth(image.CGImage);
    GLuint height = CGImageGetHeight(image.CGImage);
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    // Allocate memory for image
    void *imageData = malloc( height * width * 4 );
    CGContextRef imgcontext = CGBitmapContextCreate(
                                                imageData, width, height, 8, 4 * width, colorSpace,
                                                kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big );
    CGColorSpaceRelease( colorSpace );
    CGContextClearRect( imgcontext,
                   CGRectMake( 0, 0, width, height ) );
    CGContextTranslateCTM( imgcontext, 0, height - height );
    CGContextDrawImage( imgcontext,
                   CGRectMake( 0, 0, width, height ), image.CGImage );

    // Generate texture in opengl
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height,
             0, GL_RGBA, GL_UNSIGNED_BYTE, imageData);
    // Release context
    CGContextRelease(imgcontext);
    // Free Stuff
    free(imageData);
    [image release];
    [texData release];

    // Create and return texture

    tex.texture=texture;
    tex.width=width;
    tex.height=height;
    return tex;
}



GLuint makeTexture(NSString* path){
    GLuint texture[1]={-1};
    glGenTextures(1, texture);
    glBindTexture(GL_TEXTURE_2D, texture[0]);

    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); 
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);



    path = [[NSBundle mainBundle] pathForResource:path ofType:@"png"];
    NSData *texData = [[NSData alloc] initWithContentsOfFile:path];
    UIImage *image = [[UIImage alloc] initWithData:texData];
    if (image == nil)
        NSLog(@"Do real error checking here");

    GLuint width = CGImageGetWidth(image.CGImage);
    GLuint height = CGImageGetHeight(image.CGImage);
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    void *imageData = malloc( height * width * 4 );
    CGContextRef context = CGBitmapContextCreate( imageData, width, height, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big );
    CGColorSpaceRelease( colorSpace );
    CGContextClearRect( context, CGRectMake( 0, 0, width, height ) );
    CGContextTranslateCTM( context, 0, height - height );
    CGContextDrawImage( context, CGRectMake( 0, 0, width, height ), image.CGImage );

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, imageData);

    CGContextRelease(context);

    free(imageData);
    [image release];
    [texData release];

    return texture[0];
}

如果你能向我指明正确的方向,那将非常感激。